It's the middle of the night.

It's the middle of the night.

It's pouring with rain.

You've woken up in the middle of a field, alone, surrounded by dead bodies.

And you have no idea who you are.

Myfanwy Thomas doesn't know what has happened to her. All she has is a collection of letters, written by her past self, to guide her through the improbable world in which she suddenly finds herself. They contain information - on her life, on the improbable powers she has at her fingertips, and on the mysterious organisation she works for.

They also contain a warning: someone is trying to kill you.

Desperately trying not to be discovered, Myfanwy has to navigate the rigours of her life and job, while trying to find out which of the faces closest to her past self betrayed her . . .

. . . before they try again.